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college chemisrty

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A cylinder with a movable piston contains 2.00 of helium, , at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2.00 to 4.50 ? (The temperature was held constant.)
Express your answer numerically in grams.

  • college chemisrty - ,

    no units again.
    That's like going to the store and asking the price of a gallon of milk. The clerk tells you 2. What does that mean? Absolutely nothing. It could be 2 mils, 2 cents, 2 dollars, 2 euros, 2 lira, what?

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